Which joint is used at corners and at the floor?

Which joint is used at corners and at the floor?

• A. Coping
• B. Butt
• C. Dado
• D. Rabbet

Answer: (B)

When connecting trim pieces at corners and where trim meets the floor, a butt joint is the standard choice. It’s a simple end-to-face connection: the end of one piece sits against the face of the adjacent piece, and you fasten it with nails or screws. This makes it quick to cut and easy to install, which is why you see it used at room corners and along the floor where baseboards meet the wall and floor plane. Coping is used for matching the profile at inside corners so the joints look tight when molding meets molding. Dado creates a groove to accept another piece, like a shelf or panel, not a corner-to-floor connection. Rabbet forms a notch along an edge to accept another piece, which is typical in cabinetry or where back panels fit, not for basic corner or floor transitions.

When connecting trim pieces at corners and where trim meets the floor, a butt joint is the standard choice. It’s a simple end-to-face connection: the end of one piece sits against the face of the adjacent piece, and you fasten it with nails or screws. This makes it quick to cut and easy to install, which is why you see it used at room corners and along the floor where baseboards meet the wall and floor plane.

Coping is used for matching the profile at inside corners so the joints look tight when molding meets molding. Dado creates a groove to accept another piece, like a shelf or panel, not a corner-to-floor connection. Rabbet forms a notch along an edge to accept another piece, which is typical in cabinetry or where back panels fit, not for basic corner or floor transitions.